★ Ursus Knife | Doppler Phase 4 (Factory New)

The ★ Ursus Knife | Doppler Phase 4 (Factory New, FN) is a Covert ★ knife finish, a mostly blue marbled pattern spread over a black base. Factory New puts the blade at the bottom of the float range, where that blue marbling reads at its most saturated. Most players just call it the ursus doppler phase 4 — or simply the ursus phase 4.

Design

Phase 4 leans heavily blue, marbled across a black base in one of the more saturated color spreads the Doppler pattern produces. It carries the flavor line "Getting lost in its color can prove fatal," which suits how striking this phase looks.

★ Ursus Knife | Doppler Phase 4 (Factory New) Float and Wear

Phase 4 is float-capped between 0.00 and 0.08, meaning Factory New and Minimal Wear (MW) are the only two grades this finish reaches — it never ages past a near-mint look. Factory New covers roughly 0.00–0.07 on the float scale, the lowest-float and sharpest the blue marbling ever appears.

Ursus Knife | Doppler Phase 4 Rarity

Rarity: Covert ★ — the gold-tier rare special ("knife") slot, ranked above every ordinary Covert weapon skin a case can drop. That scarcity is about pulling the knife slot at all, before wear is even a factor.

Ursus Knife | Doppler Phase 4 Case and Collection

Phase 4 isn't locked to one collection — it comes from the Prisma Case and the Prisma 2 Case. Both share the same roughly 0.26% rare-special ("knife") pull rate, so most copies are bought on the market rather than freshly unboxed.

Ursus Knife Doppler Phases

The Doppler pattern on this knife splits into several fixed phases, and this copy is locked into Phase 4 for good — the phase never shifts with wear. The gem phases (Ruby's red, Sapphire's blue, and the iridescent Black Pearl) sit above the numbered Phase 1 through 4 in scarcity and price, but within the numbered lineup, Phase 4's saturated blue is one of the two most in-demand results alongside Phase 2's pink.

StatTrak & Souvenir

A StatTrak™ version of this knife exists, permanently tracking confirmed kills through every trade or sale. There's no Souvenir version at all — knives are never included in Major-tournament souvenir packages, regardless of case or phase.

Ursus Knife | Doppler Phase 4 Price

Factory New sits above Minimal Wear on the Phase 4 price ladder, and the finish overall lands in high-end territory with a thin market, priced alongside this knife's rarer finishes rather than as an entry point. It's available to buy on Skin.Land with instant delivery and no hidden fees. Prices for the phase 4 ursus track the exterior, the float and whether the copy carries StatTrak™, so check the live number on this page.

FAQ

What case is the Ursus Knife Doppler Phase 4 in?

It drops from the Prisma Case and the Prisma 2 Case rather than a single collection. Because the rare-special ("knife") tier only lands around 0.26% of openings from either box, most buyers pick up their Phase 4 on the market instead of chasing a case.

Which Doppler phase is best on the Ursus Knife?

The gem phases — Ruby, Sapphire, and Black Pearl — outrank every numbered phase in scarcity and price. Among the numbered phases, Phase 4's saturated blue is one of the two most sought-after results, tied closely with Phase 2's pink. The phase is fixed per copy and never changes with wear.

What are the best gloves for the Ursus Knife | Doppler Phase 4?

Phase 4's dominant blue marbling pairs naturally with blue or navy gloves for a matched loadout, or black gloves if you'd rather let the blade carry the color alone. Warm oranges and reds tend to clash with this cool palette. For the best Ursus Knife Doppler Phase 4 glove combo, lean into blue tones or stay neutral black.